Motor with improved stator casing

Abstract

A motor has a stator including a coil bobbin with winding sections to be wound by windings and a terminal section. The terminal section outwardly protrudes in a radial direction of the coil bobbin and has fixed protruded terminal pins that are to be connected to winding start sections and wiring end sections of the windings. A curled case is placed over an exterior of the windings of the stator. The curled case has end sections in the peripheral direction and an opening section defined by the end sections of the curled case. The terminal section protrudes through the opening section, and an opening angle of the opening section is less than one half of the entire periphery of a circle.

What is claimed is:  
     
       1. A motor comprising; 
       a stator;  
       a rotor disposed in the stator, the rotor having a rotor shaft that protrudes from at least one end of the stator;  
       a metal frame that supports the rotor shaft and that is affixed to one end face of the stator provided in the axial direction of the stator, the frame having a fixing surface to be affixed to the stator and a passing aperture in the fixing surface for passing the rotor shaft; and  
       a cylindrical sleeve section for passing the rotor shaft provided at an edge of an aperture in the stator, wherein the cylindrical sleeve section extends into the passing aperture, and wherein the cylindrical sleeve section is formed from a material that has a lower hardness than that of the rotor shaft.  
     
     
       2. A motor according to  claim 1 , wherein the cylindrical sleeve section has an axial length generally identical with an axial length of the passing aperture in the axial direction. 
     
     
       3. A motor according to  claim 1 , wherein the cylindrical sleeve section has an axial length greater than an axial length of the passing aperture in the axial direction. 
     
     
       4. A motor according to  claim 1 , wherein the cylindrical sleeve section has a convex section provided on an external surface thereof to engage a concave section provide in the frame to thereby position the stator with respect to the frame. 
     
     
       5. A motor comprising: 
       a stator having a coil bobbin comprising a resin member and an aperture section;  
       a rotor disposed opposite to the aperture section of the stator, the rotor having a metal rotor shaft that protrudes from at least one end of the stator;  
       a metal frame that supports the rotor shaft and affixed to one end face of the stator provided in the axial direction of the stator, the frame having a fixing surface to be affixed to the stator and a passing aperture for passing the rotor shaft, the passing aperture being disposed in a manner to overlap the aperture section of the coil bobbin for passing the rotary shaft; and  
       a yoke having pole teeth disposed opposite to the rotor, the yoke being assembled with the coil bobbin in one piece by an insert forming method, wherein the coil bobbin has a cylindrical sleeve section that is inserted in the passing aperture of the metal frame and formed integrally with the coil bobbin by a resin member at an edge of the aperture section of the stator.  
     
     
       6. A motor according to  claim 5 , wherein the metal frame includes a first plane section that is affixed to one end face of the stator in the axial direction and a second plane section disposed opposite to the first plane section, wherein the rotor shaft protrudes from one side of the aperture section of the stator, passes through the aperture section and a passing aperture that is formed in the first plane section, and is supported by a bearing provided in the second plane section of the frame. 
     
     
       7. A motor according to  claim 5 , wherein the cylindrical sleeve section has a measurement in the axial direction that is generally identical or greater than a measurement of the passing aperture in the axial direction. 
     
     
       8. A motor according to  claim 5 , wherein the cylindrical sleeve section has a convex section provided on an external surface thereof such that the convex section serves as a positioning section to be used when the frame is affixed to the stator. 
     
     
       9. A motor comprising: 
       a stator assembly; and  
       a frame; wherein the frame includes structure at a first end configured to hold a first end of a rotor shaft, and wherein the frame includes structure that defines a passing aperture configured for passage of the rotor shaft at a second end opposite the first end of the frame;  
       wherein the stator assembly includes a sleeve section that defines a sleeve aperture configured for passage of the rotor shaft; and  
       wherein the sleeve section is configured for insertion in the passing aperture of the frame so that the sleeve aperture lies inside the passing aperture of the frame.  
     
     
       10. The motor of  claim 9 , wherein the sleeve aperture of the sleeve section has an axial length that is generally the same as am axial length of the passing aperture of the frame. 
     
     
       11. The motor of  claim 9 , wherein the sleeve aperture of the sleeve section has an axial length that is greater than the axial length of the passing aperture of the frame. 
     
     
       12. The motor of  claim 9 , wherein an outer surface of the sleeve section has a convex section configured to engage a concave section in the frame to position the stator with respect to the frame. 
     
     
       13. The motor of  claim 9 , wherein the structure of the sleeve section that defines the sleeve aperture is formed of a material that has a lower hardness than that of the rotor shaft. 
     
     
       14. The motor of  claim 13 , wherein the structure of the sleeve section that defines the sleeve aperture is a resin material and the rotor shaft is formed of a metal. 
     
     
       15. The motor of  claim 9 , wherein the stator assembly includes a coil bobbin and wherein the sleeve section formed integrally with the coil bobbin.